6:26pm: Further reports of live ammunition being used on protesters in Tripoli, with lots of tweets saying security forces are again driving cars around the city, shooting at everyone and everything. Ahmed Elgazir, a human rights researcher, told Al Jazeera that Libya News Centre, an organisation based in Geneva, had received a call for help from a woman "witnessing the massacre" in progress, who called on a satellite phone after landlines were cut.

6:30pm: Planes of the Libyan Air Force reportedly opening fire on protesters in central Tripoli. No way to confirm this currently - but we are getting many reports of chaos on the streets of the capital.